#include <stdio.h>

int main()
{
    int p,q,r,s,count = 0;
    printf("The 4 fractions which sum is equal 1 are:\n");
    for(p = 2;p < 5;p++)
    for(q = p;q < 7;q++)
    for(r = q;r < 13;r++)
    if(p*q*r - q*r - p*r - p*q != 0)
    {
        s = (p*q*r)/(p*q*r - q*r - p*r - p*q);
        if(!((p*q*r) % (p*q*r - q*r - p*r - p*q)) && s >= r)
        printf("[%2d]1/%d + 1/%d + 1/%d + 1/%d = 1\n",++count,p,q,r,s);
    }
}